BUN/Creatinine Ratio
Quest Diagnostics
Sample type: Serum
Requires fasting: No
Phlebotomy required
Details
BUN/Creatinine Ratio - this test measures the levels of blood urea nitrogen (BUN) and creatinine in the blood and calculates their ratio. This ratio is useful for assessing kidney function and diagnosing kidney-related conditions.
- Creatinine
- BUN/Creatinine Ratio
- Estimated Glomerular Filtration Rate
- Blood Urea Nitrogen
Estimated days for results: Results should be available in 2 - 5 business days after the sample is collected
BUN/Creatinine Ratio
This test measures the levels of blood urea nitrogen (BUN) and creatinine in the blood and calculates their ratio. This ratio is useful for assessing kidney function and diagnosing kidney-related conditions.
This test measures the levels of blood urea nitrogen (BUN) and creatinine in the blood and calculates their ratio. This ratio is useful for assessing kidney function and diagnosing kidney-related conditions.
What patients is this test right for?
This test is particularly useful for individuals showing symptoms or having conditions that might affect kidney function.
What type of sample is required for this test?
2 mL serum.
Transport Container: Serum separator tube (SST).
Transport room temperature.
Transport Container: Serum separator tube (SST).
Transport room temperature.
Test Resources
For more information, please consult your healthcare provider.
2–5 business days
Urea Nitrogen (BUN)
Age Male (mg/dL) Female (mg/dL)
<1 Month 4-12 3-17
1-11 Months 2-13 4-14
1-3 Years 3-12 3-14
4-19 Years 7-20 7-20
≥20 Years 7-25 7-25
Creatinine
Age Male (mg/dL) Female (mg/dL)
≤2 days 0.79-1.58 0.79-1.58
3-27 days 0.35-1.23 0.35-1.23
1 month-9 years 0.20-0.73 0.20-0.73
10-12 years 0.30-0.78 0.30-0.78
13-15 years 0.40-1.05 0.40-1.00
16-17 years 0.60-1.20 0.50-1.00
18-29 years 0.60-1.24 0.50-0.96
30-39 years 0.60-1.26 0.50-0.97
40-49 years 0.60-1.29 0.50-0.99
50-59 years 0.70-1.30 0.50-1.03
60-69 years 0.70-1.35 0.50-1.05
70-79 years 0.70-1.28 0.60-1.00
≥80 years 0.70-1.22 0.60-0.95
For patients >49 years of age, the upper reference limit for creatinine is approximately 13% higher for people identified as African-American.
eGFR
≥60 mL/min/1.73m2
Bun/Creatinine Ratio
Age Ratio Calculation
<1 year Not Established
1-5 years 16-50 calc
6-10 years 13-36 calc
11-16 years 9-25 calc
≥17 years 6-22 calc
Age Male (mg/dL) Female (mg/dL)
<1 Month 4-12 3-17
1-11 Months 2-13 4-14
1-3 Years 3-12 3-14
4-19 Years 7-20 7-20
≥20 Years 7-25 7-25
Creatinine
Age Male (mg/dL) Female (mg/dL)
≤2 days 0.79-1.58 0.79-1.58
3-27 days 0.35-1.23 0.35-1.23
1 month-9 years 0.20-0.73 0.20-0.73
10-12 years 0.30-0.78 0.30-0.78
13-15 years 0.40-1.05 0.40-1.00
16-17 years 0.60-1.20 0.50-1.00
18-29 years 0.60-1.24 0.50-0.96
30-39 years 0.60-1.26 0.50-0.97
40-49 years 0.60-1.29 0.50-0.99
50-59 years 0.70-1.30 0.50-1.03
60-69 years 0.70-1.35 0.50-1.05
70-79 years 0.70-1.28 0.60-1.00
≥80 years 0.70-1.22 0.60-0.95
For patients >49 years of age, the upper reference limit for creatinine is approximately 13% higher for people identified as African-American.
eGFR
≥60 mL/min/1.73m2
Bun/Creatinine Ratio
Age Ratio Calculation
<1 year Not Established
1-5 years 16-50 calc
6-10 years 13-36 calc
11-16 years 9-25 calc
≥17 years 6-22 calc
Blood Draw Options with Fullscript
Fullscript offers several convenient phlebotomy options to complete your lab testing:
Quest Diagnostics Patient Service Centers (PSC)
- Location: Visit a nearby Quest Diagnostics Patient Service Center.
- Cost: $10 sample collection fee (paid during lab order checkout).
- Scheduling: Schedule your appointment here. Appointments are recommended to reduce wait times. Walk-ins are accepted, but may experience delays. Aim to arrive 10 minutes before your appointment.
- Collection Instructions:
- Bring a valid ID.
- Bring your digital or printed requisition form, available in the Labs tab of your Fullscript account.
- Check-in: Scan the QR code from your confirmation email or follow kiosk instructions.
- More Info: Quest Diagnostics blood draw guide
Getlabs Mobile Phlebotomy
- Location: Sample collection at your home or office.
- Cost: $85 sample collection fee (paid during lab order checkout).
- Availability: Available in most locations – enter your ZIP code during checkout to confirm.
- Scheduling: Schedule your appointment here through your Fullscript account.
- Collection Instructions:
- Have your digital or printed requisition form and valid ID ready.
- Your phlebotomist will contact you by phone to coordinate arrival.
- More Info: Getlabs blood draw guide
Specimen
- Preferred Specimen(s): 2 mL serum
- Alternative: NA
- Minimum Volume: 1 mL
- Collection Instructions: NA
Storage and shipping instructions
- Transport Container: Serum separator tube (SST)
- Transport Temperature: Room Temperature
- Specimen Stability:
- Room temperature: 7 days
- Refrigerated: 5 days
- Frozen: 28 days
- Reject Criteria:
- Plasma
State restrictions:
Patient can't order this test if they are located in Hawaii, Puerto Rico, New Jersey, New York, or Rhode Island
